unnameable
adjective
too vague or mysterious to be identified or referred to by a name; not identifiable.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Accustomed only to the chaste touching of a maiden's face, the kiss of the white men he instinctively regarded as unnameably unclean.
From The Eternal Maiden by T. Everett Harré